Cephalis multilobate, separated by an oblique constriction from the subcylindrical thorax, which is somewhat larger and slightly curved. Occipital lobe conical, of the same length as the posterior part of the triangular frontal half of the shell, which is divided into five to seven lobes, two or three odd lobes in the median part, and one or two pairs of lateral lobes; very variable in size and form of the lobes. Mouth of the thorax wide, truncate.
Dimensions.—Length of the shell 0.12, breadth 0.07.
Habitat.—Central Pacific, Station 271 to 274, depth 2350 to 2750 fathoms.
5. Botryopyle inclusa, n. sp. (Pl. [96], fig. 5).
Cephalis multilobate, campanulate, separated by a sharp constriction from the inflated thorax, which is nearly twice as long and broad. Both joints of the shell are irregularly lobate, with numerous vaulted lobes of different sizes, and partly internal septa. Pores small and numerous.
Dimensions.—Length of the shell 0.1, breadth 0.06.
Habitat.—Mediterranean (Candia), Spratt, depth 1620 fathoms.
Genus 489. Acrobotrys, Haeckel,[[106]] 1881, Prodromus, p. 440.
Definition.—Lithobotryida with tubes on the cephalis, and with the mouth of the thorax open.
The genus Acrobotrys differs from the preceding Botryopyle in the development of radial tubes, and from its probable ancestral form, Cannobotrys, in the development of a thorax, the basal mouth of which remains open. According to the varying number of the tubes we may distinguish the following five subgenera (corresponding to those of Cannobotrys), viz., (1) Acrobotrantha (monosolenia) with a single (apical) tube; (2) Acrobotrella (disolenia) with two divergent tubes (an apical and a sternal); (3) Acrobotrissa (trisolenia) with three sagittal tubes (an apical, a caudal, and a sternal); (4) Acrobotromma (tetrasolenia) with four tubes, like the four typical spines of Cortina; and (5) Acrobotrusa (pentasolenia) with five feet, corresponding to the five typical spines of Stephanium.